Exercise device

ABSTRACT

An exercise device is described. An exercise device including a body, the body having a top, a bottom, a first end located at one edge of the body, a second end located at an opposite end of the body, and first and second sides extending between the first and second ends; a first axle connected to a first wheel, the first axle also connected to the body proximate the first end at a first hub; a first spring having a first spring end, the first spring positioned at least partially within the first axle, with the first spring end slidably connected to one of the first wheel and the first hub at a first junction, wherein the first junction is configured to convey torque between the one of the first hub and the first wheel and the first spring end.

CROSS REFERENCE TO RELATED APPLICATIONS

This application is a continuation of and claims the benefit of andpriority to PCT/US 20107/031838 filed on May 9, 2017 which is acontinuation of and claims the benefit of and priority to U.S. patentapplication Ser. No. 15/590,983, filed on May 9, 2017 which claims thebenefit of U.S. Provisional Patent Appl. No. 62/432,255 entitled“EXERCISE PLATFORM” and filed on Dec. 9, 2016, the disclosures of whichare incorporated herein by reference in their entireties.

TECHNICAL FIELD

This disclosure relates to exercise systems and devices includingportable exercise devices that provide a resistance force or torque.

BACKGROUND

The present disclosure relates to exercise devices, such as can be usedfor various exercises to condition or strengthen various muscles,including the core, of a person. Exercise devices such as stationarymachines, portable machines and small portable machines can be used forvarious exercise routines. Some exercise devices can provide a resistiveforce, such as through the use of springs, rubber bands, weights orgravity. Some exercise devices can be very sophisticated and provide agreat deal of flexibility in performing a number of exercises, but beexpensive to purchase and complicated to set-up and use.

One important group of muscles to exercise is frequently referred to asthe “core.” This group of muscles can include muscles of an individual'storso. In various definitions, the core can include one or more of thepelvic floor muscles, transversus abdominis, multifidus, internal andexternal obliques, rectus abdominis, erector spinae, longissimusthoracis, diaphragm, latissimus dorsi, gluteus maximum, trapezius, andother muscles as well. Having a strong core is believed to contribute togood posture and balance as well as decreasing back and joint pain,muscle fatigue, nerve pain and injury, improve blood circulation, bloodpressure, personal energy and positive emotional outlook.

Exercises without exercise equipment can be used to provide generalexercise, but exercise equipment can provide additional benefits to anexercise routine, such as to assist in improving form, improve targetingof individual muscles or muscle groups, facilitate a different/greaterrange of movement during the exercise and vary the resistance during theexercise as compared to exercise without equipment.

One option for individuals that would like to use exercise equipmentduring a workout would be to join a gym. However, gym memberships can beexpensive and frequenting agent can be inconvenient. Purchasing exerciseequipment can expensive and the equipment can be bulky. Accordingly,there is a need for compact and inexpensive exercise equipment which canassist in providing an improved exercise experience.

SUMMARY

In a first aspect, an exercise device is provided, the exercise devicecomprising: a body, the body having a top, a bottom, a first end locatedat one edge of the body, a second end located at an opposite end of thebody, and first and second sides extending between the first and secondends; first and second axles connected to and rotationally locked tofirst and second wheels, respectively, the first and second wheels ableto rotate both in clockwise and counterclockwise directions in relationto the body, the first axle also connected to the body proximate thefirst end at a first hub and the second axle also connected to the bodyproximate the second end at a second hub; a first spring with a wheelend and a hub end, the first spring positioned at least partially withinthe first axle, with the first spring wheel end slidably connected tothe first wheel at a first wheel junction, wherein the first wheeljunction is configured to convey torque between the first wheel and thefirst spring wheel end, and the first spring hub end slidably connectedto the first hub at a first hub junction, wherein the first hub junctionis configured to convey torque between the first hub and the firstspring hub end; and a second spring with a wheel end and a hub end, thesecond spring positioned at least partially within the second axle, withthe second spring wheel end slidably connected to the second wheel at asecond wheel junction, wherein the second wheel junction is configuredto convey torque between the second wheel and the second spring wheelend, and the second spring hub end slidably connected to the second hubat a second hub junction, wherein the second hub junction is configuredto convey torque between the second hub and the second spring hub end;when the first and second wheels are rotated against respective firstand second spring torques, energy is stored in the first and secondsprings and the first and second springs apply restoring torque to thefirst and second wheels, respectively.

In a second aspect, an exercise device is provided, the exercise devicecomprising: a body, the body having a top, a bottom, a first end locatedat one edge of the body, a second end located at an opposite end of thebody, and first and second sides extending between the first and secondends; a first axle connected to a first wheel, the first axle alsoconnected to the body proximate the first end at a first hub; a firstspring having a first spring end, the first spring positioned at leastpartially within the first axle, with the first spring end slidablyconnected to one of the first wheel and the first hub at a firstjunction, wherein the first junction is configured to convey torquebetween the one of the first hub and the first wheel and the firstspring end.

In a third aspect, a method of using an exercise device is provided, themethod comprising: moving an exercise device away from a person's waistwhile the person's feet are placed on a body of the exercise device andthe first and second wheels are on a surface, wherein when the exercisedevice is moved away from the person's waist, the first and secondwheels rotate along the surface, and torque energy is stored in thefirst and second springs; and moving the exercise device toward theperson's waist while the person is assisted by or resists torquesupplied to the first and second wheels by the first and second springs,respectively, wherein the exercise device comprising: the body, the bodyhaving a top, a bottom, a first end located at one edge of the body, asecond end located at an opposite end of the body, and first and secondsides extending between the first and second ends; first and secondaxles connected to and rotationally locked to first and second wheels,respectively, the first and second wheels able to rotate both inclockwise and counterclockwise directions in relation to the body, thefirst axle also connected to the body proximate the first end at a firsthub and the second axle also connected to the body proximate the secondend at a second hub; a first spring with a wheel end and a hub end, thefirst spring positioned at least partially within the first axle, withthe first spring wheel end slidably connected to the first wheel at afirst wheel junction, wherein the first wheel junction is configured toconvey torque between the first wheel and the first spring wheel end,and the first spring hub end slidably connected to the first hub at afirst hub junction, wherein the first hub junction is configured toconvey torque between the first hub and the first spring hub end; and asecond spring with a wheel end and a hub end, the second springpositioned at least partially within the second axle, with the secondspring wheel end slidably connected to the second wheel at a secondwheel junction, wherein the second wheel junction is configured toconvey torque between the second wheel and the second spring wheel end,and the second spring hub end slidably connected to the second hub at asecond hub junction, wherein the second hub junction is configured toconvey torque between the second hub and the second spring hub end; whenthe first and second wheels are rotated against respective first andsecond spring torques, energy is stored in the first and second springsand the first and second springs apply restoring torque to the first andsecond wheels, respectively.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 shows an embodiment of an end of an exercise device.

FIG. 2 shows an embodiment of an exercise device having two wheels.

FIG. 3 shows an embodiment of a wheel junction.

FIG. 4 shows an embodiment of a hub junction.

FIG. 5 shows an embodiment of a spring.

FIG. 6 shown an embodiment of an exercise device.

FIG. 7 shows an embodiment of an exercise device having a strap.

DETAILED DESCRIPTION

In the following description, numerous specific details are set forth toclearly describe various specific embodiments disclosed herein. Oneskilled in the art, however, will understand that the presently claimedinvention may be practiced without all of the specific details discussedbelow. In other instances, well known features have not been describedso as not to obscure the invention.

In an embodiment of an exercise device 1, an exercise device can includea body 2 connected to a wheel 3 through a hub assembly 4 where the hubassembly is able to store torsional energy. In some embodiments, such asis shown in FIG. 1, the wheel 3 and hub assembly 4 can be proximate afirst end of the body 2. In some embodiments, such as is shown in FIG.2, an exercise device can include first and second wheels 3 attached tobody 2 through respective first and second hub assemblies 4. In someembodiments, the first and second wheels and first and second hubassemblies 2 can be located proximate opposite ends of body 2, as shownin FIG. 2.

The hub assembly 4 can comprise a hub 5, axle 6 and spring 11. In oneembodiment, as shown in FIG. 1, the hub 5 can be connected to an axle 6at a hub end 7 of the axle 6, with the axle 6 extending outward from thehub 5. External to the axle 6 are one or more bearings 8 in contact withthe axle 6 and providing a rotating connection between the axle 6 andthe housing 9. Bearings 8 can be of any suitable type, such as ball,sleeve, bushing, roller, etc. The axle 6 connected to a wheel 3 at thewheel end 10 of the axle 6. Within axle 6 is located spring 11. Spring11 has a hub end 12 (“spring hub end”) connected to the hub junction 13located on the hub 5, and a wheel end 14 (“spring wheel end”) of spring11 connected to the wheel junction 15 located on the wheel 3.

In some embodiments, one or both of the hub junction 13 and the wheeljunction 15 are connected to their respective ends of spring 11 by wayof sliding connections, such that wheel end 14 of spring 11 is slidablyreceived into wheel junction 15 and/or hub end 12 of spring 11 isslidably received into hub junction 13. In some embodiments, a hubjunction 13 can be configured to transfer torque between the hubjunction 13 and the spring 11. In some embodiments, the wheel junction15 can be configured to transfer torque between the wheel junction 15and the spring 11. In some embodiments, both the wheel junction 15 andthe hub junction 13 can be configured to transfer torque between thespring 11 and the wheel junction 15 and the hub junction 13.

Junctions

Junctions, such as wheel junctions and hub junctions are configured totransfer torque between the junction and the spring. In someembodiments, a junction can comprise a relief opening, such as a slot,which receives an end of the spring, such as a hub end or a spring end.FIG. 3 shows an embodiment of a wheel junction having a slot and FIG. 4shows an embodiment of a hub junction having a slot. The spring end caninclude one or more extensions extending from the spring, such as aloop, a tab, a pin or another shape or a series of loops, tabs, pins,other shapes and combinations thereof which when inserted into therelief opening can interact with the interior surfaces of the reliefopening to transfer forces therebetween such as in the form of a couple.In some embodiments, the relief opening can extend entirely across theface of the junction so as to have open ends at each edge of thejunction. In some embodiments, the relief opening can extend across onlya portion of the junction so as to have no open ends or only one openend at an edge of the junction.

In some embodiments, the relief opening can comprise two parallel facesextending into the face of the junction. In some embodiments, one ormore faces of the relief opening can be curves. In some embodiments, therelief opening can have faces which are planar. In some embodiments, thejunction can comprise more than one relief opening, such as where two ormore relief opening cross one another or where two or more reliefopening do not intersect with one another. In some embodiments, therelief opening can have a shape where the length is substantially thesame as the width, such as in the shape of a square, or where the lengthis longer than the width, such as in the shape of a rectangle. In someembodiments, the relief opening can be in the shape of a triangle orother geometric shape where a spring end would be able to interact withwall to transfer torque. In some embodiments, the relief opening cancomprise multiple openings, such as two or more holes and the spring endcan comprise extensions which fit into two or more holes so as totransfer torque. In some embodiments, the two or more holes can be inthe shape of circles, squares, triangles, ovals or other suitable shape,with one hole having the same or different shape from the other.

In some embodiments, the junction can have one or more extensions, asdescribed above for spring end, and the spring end can include a reliefopening as described above for the junctions, where the one or moreextensions are slidably received into the relief openings and transfertorque.

In some embodiments, a wheel junction can be a part of the wheel or thewheel junction can be a separate part attached to the wheel. FIG. 3shows an embodiment of a replaceable wheel junction having a squareshape, however different shapes can be used. In some embodiments, thereplaceable wheel junction can be made to have differentsizes/shapes/configurations/number of holes or slots for use withdifferent spring ends. In some embodiments, a replaceable wheel junctioncan be dropped into a receptacle in the wheel or it can be a frictionfit into a receptacle in the wheel or it can be attached to the wheel byother means as would be understood by those of skill in the art.

In some embodiments, the hub junction can be a part of the hub or thehub junction can be a separate part attached to the hub. In someembodiments, the hub junction can be replaceable having features asdiscussed for a replaceable wheel junction.

Spring Tension/Movement of the Exercise Device

In some embodiments, as the wheel turns in relation to the body,torsional energy will be stored in the spring 11. Rotating the wheelfurther results in greater energy being stored in the spring 11.

When the exercise device is placed on a surface and moved in a firstdirection, the wheel 3 will turn and energy can be stored in the spring11. The further the exercise device is moved, such as by pushing theexercise device with the wheel(s) turning as the exercise device movesacross a surface, more energy can be stored in spring 11. As energy isstored in the spring, a countering force can be present which resistsfurther movement of the exercise device in the first direction. If thepushing force is decreased to below that of the countering force, theexercise device will move backwards counter to the first direction. Insome embodiments, the exercise device can also be moved in a seconddirection, opposite to the first directions and the spring will storeenergy and apply a countering force in an opposite direction to when theexercise device is moved in the first direction.

Spring

In various embodiments, the spring 11 can be a material which is capableof storing torsional energy. In some embodiments, the spring 11 can be acoil spring, such as is shown in FIG. 5. In various embodiments of acoil spring, the coil spring can have different numbers of loops, theloops can be space close to one another, such as would be associatedwith a coil spring that is tightly wound, or the loops can be spacedfurther apart, such as would be associated with a coil spring that ismore loosely wound. In various embodiments, the spring material can bethicker or thinner and of a suitable material so as to provide desirablespring force characteristics and energy storage.

In some embodiments, the spring 11 can have a different shape, such asbeing in the form of a rod, a sheet or multiple rods, or sheets orcombinations thereof.

Spring material can be or comprise any suitable metal, such as steel,stainless steel, steel alloy, bronze, phosphor bronze, titanium,beryllium copper, or other metals and combinations thereof. Springmaterials can also be or comprise polymer or elastomers.

In some embodiments, the spring 11 can be installed entirely within theaxle 6. In some embodiments, the spring 11 can be located partiallywithin and partially without the axle 6. In some embodiments, the spring11 can be located such that at least a portion of one or both of thespring ends extend from the axle 6. In some embodiments, the spring 11can be located entirely within the wheel 3 where the spring 11 does notextend past the inner plane 16 and the outer plane 17 of the wheel 3. Insome embodiments, the spring 11 can be located only partially within thewheel 3, where the spring 11 extends only partially outside of the innerplane 16 and/or the outer plane 17 of the wheel 3. In some embodiments,the spring 11 can be located outside of the wheel 3 where the spring 11is located entirely outside of the inner plane 16 and the outer plane 17of the wheel 3.

In some embodiments, the spring 11 can be sized such that the clearancebetween the spring and the axle prevents kinking of the spring when thespring is overwound.

In some embodiments, the spring 11 is sized such that the clearancebetween the spring and the axle and/or the overall length of the spring11 relieves stress from the spring by allowing the hub and wheel ends ofthe spring 11 to move toward one another during an overwound condition,resulting in one of the hub and wheel ends of the spring 11 slipping outof the respective junction.

In some embodiments, such as shown in FIG. 1, the spring 11 can be canbe installed or replaced, for example, by removing a spring by removingthe screws 18 which attach wheel 3 to the axle 6, removing the wheel 3,and then pulling out the spring 11 from the interior of axle 6; theninstalling a spring by placing the spring 11 into the interior of axle 6so as the hub end of the spring 11 aligns with and is slidably receivedinto the hub junction such as into a slot in the hub junction; and theninstalling the wheel 3 by aligning the wheel junction with the wheel endof the spring 11, slidably receiving the wheel end of the spring 11 intothe wheel junction, and installing screws 18 to attach the wheel 3 toaxle 6.

Wheels

In some embodiments, the wheel can be rotationally affixed to the axle.In one embodiment, as shown in FIG. 1, screws 18 attach wheel 3 to axle6. However other types of fastening can also be used, such as bolts,clips, pins, nuts and the like.

In some embodiments, a body 2 can be attached to one wheel through a hubassembly 4 which can store torsional energy, as described herein. Insome embodiments, a body 2 can be attached to two wheels 18 throughrespective hub assemblies 2, each of which can store torsional energy asdescribed herein. In some embodiments, a body 2 can be attached to afirst wheel 3 through a hub assembly 4 which can store torsional energyas described herein and to a second wheel through other than a hubassembly 4 which can store torsional energy as described herein. In someembodiments, the exercise device 1 includes only one wheel and the wheelis connected to the body 2 through a hub assembly 4 which can storetorsional energy as described herein. In one embodiment, the exercisedevice includes exactly two wheels 18 and both of the two wheels areconnected to the body 2 through respective hub assemblies 2 which canstore torsional energy as described herein.

In some embodiments, an exercise device 1 can have more than two wheels,such as four wheels. In some embodiments having more than two wheels,one or more or all of the wheels can be attached to the body 2 throughrespective hub assemblies 2 which can store torsional energy asdescribed herein. In some embodiments with four wheels, one, two, threeor four wheels can be attached to the body 2 through respective hubassemblies 2 which can store torsional energy as described herein.

When a wheel 3 is attached to body 2 other than through a hub assembly 4that can store torsional energy as described herein, the wheel 3 can beattached by any suitable means such as through a fixed axle, a rotatingaxle, or otherwise as would be known to one of skill in the art.

In some embodiments, wheels of different sizes and with differentsurface contacting features (e.g. tread) can be used for example toaccommodate different exercises, different sizes of user, differentsurfaces for the exercise device to move along, and the like.

Body

In some embodiments, a body can extend between two wheels. The body canbe sized and configured for an individual using the exercise device tobe able to place any portion of a user's anatomy that is desired and inthe orientation desired. In some embodiments, the body 2 can be sizedand configured for one or two feet, hands, knees, forearms or etc. onthe body to use the exercise device. In some embodiments, one or twofeet/hands/knees/forearms/etc. can be oriented with thefeet/hands/knees/forearms oriented with the direction of movement of thebody. In some embodiments, the feet/hands/knees/forearms/etc. can beoriented sideways (e.g. with toe and heel pointing at the wheels 3) orat an angle to the direction of movement of the body 2. In someembodiments, the body can be sized and configured for an individualusing the exercise device to be able to place only one foot, hand, knee,forearm or etc. on the body to use the exercise device. In someembodiments, the body 2 can be sized and configured for a user's back orbottom to contact the body 2 during exercise.

In some embodiments, the body can include recess(es) or bump(s) orcombinations thereof on a surface of the body to interface with feet orhands or forearms or other portions of a user's anatomy and assist inplacement of the feet/hands/knees/forearms/etc. at an appropriatelocation on the body. FIG. 6 shows an embodiment of an exercise device 1having recesses 19 in the body 2. In some embodiments, the recesses orbumps can be achieved by curving the body 2.

In some embodiments, one or more straps can be positioned on the body tobe grasped by an individual while using the exercise device 1 or for theuser to place hands/feet/forearms between the strap and the body whileusing the exercise device 1. (See FIG. 7.)

In some embodiments, padding can be provided on the body.

Secondary Platform

In some embodiments, the exercise device can be used with a secondaryplatform 20 comprising a surface 21 raised off the ground as shown inFIG. 7. In general, the secondary platform 20 can be sized andconfigures to support one portion of a user's anatomy while the exercisedevice 1 supports and is moved by another portion of a user's anatomy.In some embodiments, the secondary platform can be sized and configuredfor placing one's feet thereon while one uses the exercise device withone's hands on the exercise device. In some embodiments, the secondaryplatform can be sized and configured for placing one's hand(s) on thesecondary platform or to grasp the edge(s) of the secondary platformwhile one uses the exercise device with one's foot/feet on the exercisedevice. In some embodiments, the secondary platform can be sized andconfigured to support one foot of a user while the exercise device 1supports the other foot of the user. In some embodiments, the secondaryplatform can be used to support one or both feet of a user while theexercise device support one or both hands of a user.

Operation of the Exercise Device

Generally, the exercise device operates by the spring(s) 11 providing aresisting force against rotation of the wheel(s) while the spring(s) 11store torsional energy during rotation of the wheel(s) 3, and thenreleasing this stored energy while providing a restoring force duringrotation of the wheel(s) 3 in the opposite direction. In variousembodiments, the restoring force can be a force that assists the user inthe movement of the exercise device 1 or the restoring force can be aforce that the user resists during movement of the exercise device 1.

Exercise device 1 can be employed in exercises by a user in many ways.One exemplary embodiment involves the user placing his/her hands on thebody 2 with the wheels 18 resting on a surface, the user placing his/herfeet on the surface with the user's body bent at the waist, and the userpushing the exercise device 1 away from the feet against spring force inthe exercise device 1 and at least partially straightening the user'sbody. With this movement, the exercise device is moved against aresisting force provided by the spring(s) 11 while torsional energy willbe stored in the spring(s) 11 of the exercise device 1. The user canthen move exercise device back toward the starting position and towardthe user's feet with the spring(s) 11 of the exercise device 1 providinga restoring force which can assist the user in the movement back towardthe starting position while releasing energy stored in spring(s) 11. Ina variation on this embodiment of a use, the user can place his/herhands on the surface and his/her feet on the body. In further variationson these embodiments, the starting position can be with a morestraightened body, and the motion that stores torsional energy intospring 11 can be a movement that bends the body, for example, at thewaist.

In another embodiment of an exercise with the exercise device, a usercan place one foot on the exercise device and his/her other foot on thesurface the exercise device is on or on a secondary platform that isplaced on the surface the exercise device is on, and the feet are movedalternately away from and toward each other, with the spring(s) 11alternately storing torsional energy while providing a resisting forceand releasing energy while providing a restoring force.

Having now described the invention in accordance with the requirementsof the patent statutes, those skilled in this art will understand how tomake changes and modifications to the present invention to meet theirspecific requirements or conditions. Such changes and modifications maybe made without departing from the scope and spirit of the invention asdisclosed herein.

The foregoing Detailed Description of exemplary and preferredembodiments is presented for purposes of illustration and disclosure inaccordance with the requirements of the law. It is not intended to beexhaustive nor to limit the invention to the precise form(s) described,but only to enable others skilled in the art to understand how theinvention may be suited for a particular use or implementation. Thepossibility of modifications and variations will be apparent topractitioners skilled in the art. No limitation is intended by thedescription of exemplary embodiments which may have included tolerances,feature dimensions, specific operating conditions, engineeringspecifications, or the like, and which may vary between implementationsor with changes to the state of the art, and no limitation should beimplied therefrom. Applicant has made this disclosure with respect tothe current state of the art, but also contemplates advancements andthat adaptations in the future may take into consideration of thoseadvancements, namely in accordance with the then current state of theart. It is intended that the scope of the invention be defined by theClaims as written and equivalents as applicable. Reference to a claimelement in the singular is not intended to mean “one and only one”unless explicitly so stated. Moreover, no element, component, nor methodor process step in this disclosure is intended to be dedicated to thepublic regardless of whether the element, component, or step isexplicitly recited in the Claims. No claim element herein is to beconstrued under the provisions of 35 U.S.C. Sec. 112, sixth paragraph,unless the element is expressly recited using the phrase “means for . .. ” and no method or process step herein is to be construed under thoseprovisions unless the step, or steps, are expressly recited using thephrase “comprising the step(s) of . . . ”

Concepts

Concept 1. An exercise device comprising:

a body, the body having a top, a bottom, a first end located at one edgeof the body, a second end located at an opposite end of the body, andfirst and second sides extending between the first and second ends;

first and second axles connected to and rotationally locked to first andsecond wheels, respectively, the first and second wheels able to rotateboth in clockwise and counterclockwise directions in relation to thebody, the first axle also connected to the body proximate the first endat a first hub and the second axle also connected to the body proximatethe second end at a second hub;

a first spring with a wheel end and a hub end, the first springpositioned at least partially within the first axle, with

-   -   the first spring wheel end slidably connected to the first wheel        at a first wheel junction, wherein the first wheel junction is        configured to convey torque between the first wheel and the        first spring wheel end, and    -   the first spring hub end slidably connected to the first hub at        a first hub junction, wherein the first hub junction is        configured to convey torque between the first hub and the first        spring hub end; and

a second spring with a wheel end and a hub end, the second springpositioned at least partially within the second axle, with

-   -   the second spring wheel end slidably connected to the second        wheel at a second wheel junction, wherein the second wheel        junction is configured to convey torque between the second wheel        and the second spring wheel end, and    -   the second spring hub end slidably connected to the second hub        at a second hub junction, wherein the second hub junction is        configured to convey torque between the second hub and the        second spring hub end;

when the first and second wheels are rotated against respective firstand second spring torques, energy is stored in the first and secondsprings and the first and second springs apply restoring torque to thefirst and second wheels, respectively.

Concept 2. An exercise device comprising:

a body, the body having a top, a bottom, a first end located at one edgeof the body, a second end located at an opposite end of the body, andfirst and second sides extending between the first and second ends;

a first axle connected to a first wheel, the first axle also connectedto the body proximate the first end at a first hub;

a first spring having a first spring end, the first spring positioned atleast partially within the first axle, with the first spring endslidably connected to one of the first wheel and the first hub at afirst junction, wherein the first junction is configured to conveytorque between the one of the first hub and the first wheel and thefirst spring end.

Concept 3. The exercise device of Concept 2, wherein the first springcomprises a second spring end opposite the first spring end, and thefirst spring end is slidably connected to one of the first hub and firstwheel and the second spring end is slidably connected to the other ofthe first hub and first wheel at a second junction, wherein the secondjunction is configured to transfer torque between the other of the firsthub and the first wheel and the second spring end.Concept 4. The exercise device of Concept 2, wherein the first junctionis a slot configured to receive the first spring end.Concept 5. The exercise device of Concept 3, wherein the second junctionis a slot configured to receive the second spring end.Concept 6. The exercise device of Concept 2, wherein the first axle isrotationally locked to the first wheel.Concept 7. The exercise device of Concept 2, wherein the first spring iscontained entirely within the first axle.Concept 8. The exercise device of Concept 2, wherein the body is sizedand configured for two feet to be placed upon the body and for the feetto push the body; and

the first wheel has a neutral position wherein the first spring does notapply torque to the first wheel, and when the first wheel is rotatedaway from the neutral position, energy is stored in the first spring andthe first spring applies a restoring torque to the first wheel.

Concept 9. The exercise device of Concept 3, wherein the wheel comprisesa spring cover and the junction or the second junction is located in thespring cover.Concept 10. The exercise device of Concept 2, further comprising:

a second wheel, a second axle and a second spring;

wherein the second axle is connected to the second wheel, the secondaxle is also connected to the body proximate the second end of the bodyat a second hub;

the second spring having a first spring end, the second springpositioned at least partially within the second axle, with the firstspring end of the second spring slidably connected to one of the secondwheel and the second hub at a third junction, wherein the third junctionis configured to convey torque between the one of the second hub and thesecond wheel and the first spring end of the second spring.

Concept 11. The exercise device of Concept 10, wherein:

the second spring further comprises a second spring end opposite thefirst spring end of the second spring; and

the second spring end of the second spring is slidably connected to theother of the second wheel and the second hub at a fourth junction,wherein the fourth junction is configured to convey torque between theother of the second hub and the second wheel and the second spring end.

Concept 12. The exercise device of Concept 2, wherein the first springis located above the body when the body top is facing up.Concept 13. The exercise device of Concept 2, wherein the first springis located below the body when the body top is facing up.Concept 14. The exercise device of Concept 2, wherein the first springis located at least partially within the first wheel.Concept 15. The exercise device of Concept 2, wherein the first springis located entirely within the first wheel.Concept 16. The exercise device of Concept 2, wherein the first springis a coil spring.Concept 17. A method of using the exercise device of Concept 1comprising:

moving the exercise device away from a person's waist while the person'sfeet are placed on the body of the exercise device and the first andsecond wheels are on a surface, wherein when the exercise device ismoved away from the person's waist, the first and second wheels rotatealong the surface, and torque energy is stored in the first and secondsprings; and

moving the exercise device toward the person's waist while the person isassisted by or resists torque supplied to the first and second wheels bythe first and second springs, respectively.

Concept 18. An exercise device comprising:

a body, the body having a top, a bottom, a first end located at one edgeof the body, a second end located at an opposite end of the body, andfirst and second sides extending between the first and second ends;

first and second axles connected to and rotationally locked to first andsecond wheels, respectively, the first and second wheels able to rotateboth in clockwise and counterclockwise directions in relation to thebody, the first axle also connected to the body proximate the first endat a first hub and the second axle also connected to the body proximatethe second end at a second hub;

a first spring with a wheel end and a hub end, the first springpositioned at least partially within the first axle, with

-   -   the first spring wheel end slidably connected to the first wheel        at a first wheel junction, wherein the first wheel junction is        configured to convey torque between the first wheel and the        first spring wheel end, and    -   the first spring hub end slidably connected to the first hub at        a first hub junction, wherein the first hub junction is        configured to convey torque between the first hub and the first        spring hub end; and

a second spring with a wheel end and a hub end, the second springpositioned at least partially within the second axle, with

-   -   the second spring wheel end slidably connected to the second        wheel at a second wheel junction, wherein the second wheel        junction is configured to convey torque between the second wheel        and the second spring wheel end, and    -   the second spring hub end slidably connected to the second hub        at a second hub junction, wherein the second hub junction is        configured to convey torque between the second hub and the        second spring hub end;

when the first and second wheels are rotated against respective firstand second spring torques, energy is stored in the first and secondsprings and the first and second springs apply restoring torque to thefirst and second wheels, respectively.

Concept 19. An exercise device comprising:

a body, the body having a top, a bottom, a first end located at one edgeof the body, a second end located at an opposite end of the body, andfirst and second sides extending between the first and second ends;

a first axle connected to a first wheel, the first axle also connectedto the body proximate the first end at a first hub;

a first spring having a first spring end, the first spring positioned atleast partially within the first axle, with the first spring endslidably connected to one of the first wheel and the first hub at afirst junction, wherein the first junction is configured to conveytorque between the one of the first hub and the first wheel and thefirst spring end.

Concept 20. The exercise device of Concept 19, wherein the first springcomprises a second spring end opposite the first spring end, and thefirst spring end is slidably connected to one of the first hub and firstwheel and the second spring end is slidably connected to the other ofthe first hub and first wheel at a second junction, wherein the secondjunction is configured to transfer torque between the other of the firsthub and the first wheel and the second spring end.Concept 21. The exercise device of Concept 19 or 20, wherein the firstjunction is a slot configured to receive the first spring end.Concept 22. The exercise device of any one of Concepts 20-21, whereinthe second junction is a slot configured to receive the second springend.Concept 23. The exercise device of any one of Concepts 19-22, whereinthe first axle is rotationally locked to the first wheel.Concept 24. The exercise device of any one of Concepts 19-23, whereinthe first spring is contained entirely within the first axle.Concept 25. The exercise device of any one of Concepts 19-24, whereinthe body is sized and configured for two feet to be placed upon the bodyand for the feet to push the body; and

the first wheel has a neutral position wherein the first spring does notapply torque to the first wheel, and when the first wheel is rotatedaway from the neutral position, energy is stored in the first spring andthe first spring applies a restoring torque to the first wheel.

Concept 26. The exercise device of Concept 19 or 20, wherein the firstwheel comprises a spring cover and the first junction or the secondjunction is located in the spring cover.Concept 27. The exercise device of any one of Concepts 19-26, whereinthe first spring is located above the body when the body top is facingup.Concept 28. The exercise device of any one of Concepts 19-27, whereinthe first spring is located below the body when the body top is facingup.Concept 29. The exercise device of any one of Concepts 19-28, whereinthe first spring is located at least partially within the first wheel.Concept 30. The exercise device of any one of Concepts 19-29, whereinthe first spring is located entirely within the first wheel.Concept 31. The exercise device of any one of Concepts 19-30, whereinthe first spring is a coil spring.Concept 32. The exercise device of any one of Concepts 19-31-14, furthercomprising:

a second wheel, a second axle and a second spring;

wherein the second axle is connected to the second wheel, the secondaxle is also connected to the body proximate the second end of the bodyat a second hub;

the second spring having a first spring end, the second springpositioned at least partially within the second axle, with the firstspring end of the second spring slidably connected to one of the secondwheel and the second hub at a third junction, wherein the third junctionis configured to convey torque between the one of the second hub and thesecond wheel and the first spring end of the second spring.

Concept 33. The exercise device of Concept 32, wherein:

the second spring further comprises a second spring end opposite thefirst spring end of the second spring; and

the second spring end of the second spring is slidably connected to theother of the second wheel and the second hub at a fourth junction,wherein the fourth junction is configured to convey torque between theother of the second hub and the second wheel and the second spring end.

Concept 34. A method of using the exercise device of Concept 18comprising:

moving the exercise device away from a person's waist while the person'sfeet are placed on the body of the exercise device and the first andsecond wheels are on a surface, wherein when the exercise device ismoved away from the person's waist, the first and second wheels rotatealong the surface, and torque energy is stored in the first and secondsprings; and

moving the exercise device toward the person's waist while the person isassisted by or resists torque supplied to the first and second wheels bythe first and second springs, respectively

We claim:
 1. An exercise device comprising: a body, the body having atop, a bottom, a first end located at one edge of the body, a second endlocated at an opposite end of the body, and first and second sidesextending between the first and second ends; first and second axlesconnected to and rotationally locked to first and second wheels,respectively, the first and second wheels able to rotate both inclockwise and counterclockwise directions in relation to the body, thefirst axle also connected to the body proximate the first end at a firsthub and the second axle also connected to the body proximate the secondend at a second hub; a first spring with a wheel end and a hub end, thefirst spring positioned at least partially within the first axle, withthe first spring wheel end slidably connected to the first wheel at afirst wheel junction, wherein the first wheel junction is configured toconvey torque between the first wheel and the first spring wheel end,and the first spring hub end slidably connected to the first hub at afirst hub junction, wherein the first hub junction is configured toconvey torque between the first hub and the first spring hub end; and asecond spring with a wheel end and a hub end, the second springpositioned at least partially within the second axle, with the secondspring wheel end slidably connected to the second wheel at a secondwheel junction, wherein the second wheel junction is configured toconvey torque between the second wheel and the second spring wheel end,and the second spring hub end slidably connected to the second hub at asecond hub junction, wherein the second hub junction is configured toconvey torque between the second hub and the second spring hub end; whenthe first and second wheels are rotated against respective first andsecond spring torques, energy is stored in the first and second springsand the first and second springs apply restoring torque to the first andsecond wheels, respectively.
 2. An exercise device comprising: a body,the body having a top, a bottom, a first end located at one edge of thebody, a second end located at an opposite end of the body, and first andsecond sides extending between the first and second ends; a first axleconnected to a first wheel, the first axle also connected to the bodyproximate the first end at a first hub; a first spring having a firstspring end, the first spring positioned at least partially within thefirst axle, with the first spring end slidably connected to one of thefirst wheel and the first hub at a first junction, wherein the firstjunction is configured to convey torque between the one of the first huband the first wheel and the first spring end.
 3. The exercise device ofclaim 2, wherein the first spring comprises a second spring end oppositethe first spring end, and the first spring end is slidably connected toone of the first hub and first wheel and the second spring end isslidably connected to the other of the first hub and first wheel at asecond end connector, wherein the second end connector is configured totransfer torque between the other of the first hub and the first wheeland the second spring end.
 4. The exercise device of claim 2, whereinthe junction is a slot configured to receive the first spring end. 5.The exercise device of claim 3, wherein the second end connector is aslot configured to receive the second spring end.
 6. The exercise deviceof claim 4, wherein the first axle is rotationally locked to the firstwheel.
 7. The exercise device of claim 6, wherein the first spring iscontained entirely within the first axle.
 8. The exercise device ofclaim 6, wherein the body is sized and configured for two feet to beplaced upon the body and for the feet to push the body; and the firstwheel has a neutral position wherein the first spring does not applytorque to the first wheel, and when the first wheel is rotated away fromthe neutral position, energy is stored in the first spring and the firstspring applies a restoring torque to the first wheel.
 9. The exercisedevice of claim 3, wherein the wheel comprises a spring cover and thejunction or the second end connector is located in the spring cover. 10.The exercise device of claim 2, further comprising: a second wheel, asecond axle and a second spring; wherein the second axle is connected tothe second wheel, the second axle is also connected to the bodyproximate the second end of the body at a second hub; the second springhaving a first spring end, the second spring positioned at leastpartially within the second axle, with the first spring end of thesecond spring slidably connected to one of the second wheel and thesecond hub at a second junction, wherein the second junction isconfigured to convey torque between the one of the second hub and thesecond wheel and the first spring end of the second spring.
 11. Theexercise device of claim 2, wherein: the first spring further comprisesa second spring end opposite the first spring end; and the second springend is slidably connected to the other of the first wheel and the firsthub at a second junction, wherein the second junction is configured toconvey torque between the other of the first hub and the first wheel andthe second spring end.
 12. The exercise device of claim 2, wherein thefirst spring is located above the body when the body top is facing up.13. The exercise device of claim 2, wherein the first spring is locatedbelow the body when the body top is facing up.
 14. The exercise deviceof claim 2, wherein the first spring is located at least partiallywithin the first wheel.
 15. The exercise device of claim 2, wherein thefirst spring is located entirely within the first wheel.
 16. Theexercise device of claim 2, wherein the first spring is a coil spring.17. A method of using the exercise device of claim 1 comprising: movingthe exercise device away from a person's waist while the person's feetare placed on the body of the exercise device and the first and secondwheels are on a surface, wherein when the exercise device is moved awayfrom the person's waist, the first and second wheels rotate along thesurface, and torque energy is stored in the first and second springs;and moving the exercise device toward the person's waist while theperson is assisted by or resists torque supplied to the first and secondwheels by the first and second springs, respectively.